Warnings on child-products list

[man.of.earth]

Hello,

I defined a new product, with two children. On the product page in BE, child-products tab, the child products are not listed, and I get the following warnings:

Code Select Expand

Warning: count(): Parameter must be an array or an object that implements Countable in /administrator/components/com_virtuemart/views/product/tmpl/product_edit_childs.php on line 73
Warning: Invalid argument supplied for foreach() in /administrator/components/com_virtuemart/views/product/tmpl/product_edit_childs.php on line 122
I'm not sure how this feature that seems new should work, but I was expecting that the child-products to be listed on that tab, of the parent product.